Customer has a SV8100 with UM 8000 that blew up. Trying to add 4 port Inmail license. Delete the slot where UM 8000 resides. Delete ports used by UM 8000. Add the 4 port Inmail license, shows up in Feature Activation. Make my first port 081, number the ports, put the ports in group 64, change the ports to DP...Special, make group 64 the voice mail group. Call the pilot, ring no answer. Call the voice mail ports directly and get reorder. Reboot the system and the 4 port Inmail license disappears in Feature Activation. Upload the license again, reboot and it disappears again. Software is 3.0, 256 port license is installed. PZ-VM21with VM 8000 flash card is installed. They are using 4 port VRS. Any help would be greatly appreciated...